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5. Smokers are well        of the dangers to their own health,but they simply find it hard to give up.

   A. sure   B. certain

   C. known   D. aware

5. D be well aware of...意为"对....... 充分了解/认识";be sure of...意为"对……有把握"。

题目来源:高考英语组合训练多项选择+完成句子 > 组合训练57-58

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